The current spelling of the name Nantmor is more modern – most old documents  from the 16th to the 18th century record the name as Nanmor.
The village is perhaps most famous for being the home of Dafydd Nanmor, a renowned 15th century bard (died c. 1490), who took his name from the hamlet, as did Rhys Nanmor after him. Dafydd Nanmor himself was possibly a bardic student of Rhys Goch, who lived at neighbouring Hafod Garegog.
Filmed in Nantmor in 1957 the Inn of the Sixth Happiness is a 1958 British 20th Century Fox film based on the true story of Gladys Aylward, a tenacious British maid, who became a missionary in China during the tumultuous years leading up to the Second World War.
Carneddi, a nearby hill farm, was the home of Ruth Janette Ruck, who published a trilogy of books about her experiences in the 1950s, 1960s and 1970s, namely Place of Stones, Hill Farm Story and Along Came a Llama. In 1980 she featured in the HTV About Britain series in an episode called "The Lady and the Llama", which featured a year on the farm. 
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